for you, OP. What a very difficult situation.
First, a word of hope. A number of older partners of women I know who are your age have had similar issues, and have ridden through them. The man has come around to the idea, and fallen head over heels in love with the new baby. However, a word of caution: in most cases, this has been won by the woman giving up virtually everything to do childcare, while he continues in his career.
Second, a word that is more pessimistic. If this is a really settled intention, i.e. if he really has thought about it and firmly decided that he doesn't want children at all, then I'm afraid there is very little you can do to change his mind. It definitely would not be a good idea to force his hand - it's not fair, for a start. You'll have to decide either to leave and try with someone else (or even alone) or to live with it. In either case, you will likely need psychological support and help.
Finally: whatever does happen, you will handle it and be OK. Because you don't have a choice and you have to get on with it. I don't mean this in a brutal way - I am dealing with the discovery that I can't have children myself right now, and I am devastated. But I have to go on, and I have to find purpose another way. So do you, and so you will.